import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1. 读取请求传来的参数
        req.setCharacterEncoding("utf8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        //2. 验证用户名密码
        if(!"zhangsan".equals(username) || !"123".equals(password)){
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("当前用户名或密码错误");
            return;
        }

        //3. 登录成功, 给用户创建一个会话出来
        HttpSession session = req.getSession(true);
        session.setAttribute("username", username);
        session.setAttribute("loginTime", System.currentTimeMillis());

        //4. 此时登录成功
        resp.sendRedirect("index");
    }
}
